Presume the crank journals set 90 degrees apart on this engine? Do you have a method of achieving this or just by eye?
Nick
Hi Nick, yes, as I understand it ( and that is quite a statement

) the cranks are set at 90degrees. I think that it is set by trial and error ( in my case, probably more error than trial

) I could be in error in saying that, I have read through the plans a few times but I have the memory of a fish.
I got a bit more done today, worked on the flywheel recess.
I started off by re mounting the flywheel in the 3jaw, I wasnt too worried about it being precisely concentric. I ground up a new Hss blank to do the job and then had at it.

I then changed tools to a 6mm round profile and put a little radius to take the sharp edges off.
Then I had to tackle putting the 3 holes in the flywheel. This meant breaking out the rotary table. I now have yet another item on my "To Make" list, as I need a means to attach my 3jaw self-centering chuck to the rotary table. But until then I have to make do with a slightly more convoluted means of attaching items to it.
So then, how does one secure a round item, ie my flywheel, to the Ro-Tab and get it centred up?
Well this is how I did it, there's probably many other ways, and maybe easier ones too


I eyeballed the flywheel into the center and attached with 2 clamps, but only tightened them thumb tight. Then mount a Dti on a mag base mounted on the table, with the finger set against the inside of the 5mm mounting hole. Then just rotate the table and "bump" the flywheel ( or whatever you are centering ) until the Dti reads the same all the way round the flywheel, or within reason ( I haven't finished the outer edge of the flywheel yet, so it still has some marks which bounced the Dti needle a bit, but I just got the reading at an average all the way round it )
Then drilled the three 4mm holes at 120degrees spacing.
Then I drilled and tapped m3 for the securing screw.
And this is the resulting flywheel,

That's all I got done today.
Tim